Jonastal S/III
Jonastal was started but never finished. It was a series of underground complexes in central Thüringen, southeast of the city of Gotha (near the concentration camp at Ohrdruf, the first such camp found by the Americans on German soil).
The project had several code names, depending on what part was meant, and the names also changed over time - the following names were used for all or part of this complex - Siegfried, Jasmin; the designations Olga, Burg, and S/III were sometimes used for the entire project area (including the Jonastal and the surrounding area);
Olga was also the code name for the "Amt 10" communications center bunker at Ohrdruf. The main works were dug in two sections into a hill forming the north side of the Jonas Valley, between Crawinkel and Arnstadt. This part of the project was reportedly intended as a last-ditch headquarters facility for Hitler and his staff, should they fall back from Berlin into the interior of Germany (some reports say Hitler actually spent the end of March 1945 in this or another nearby underground Führer Headquarters).
Other theories say this or a nearby site was intended for production of the intercontinental "Amerika" rocket, and even testing and production of a Nazi atomic bomb.
Most of the Jonastal complex never advanced much further than the tunnel digging stage, and the Soviets blasted most of the tunnel entrances after the war. The exact purpose of this facility remains in doubt, as does its code-names ("Siegfried" and "Olga" may actually have been names of other sites).
The project had several code names, depending on what part was meant, and the names also changed over time - the following names were used for all or part of this complex - Siegfried, Jasmin; the designations Olga, Burg, and S/III were sometimes used for the entire project area (including the Jonastal and the surrounding area);
Olga was also the code name for the "Amt 10" communications center bunker at Ohrdruf. The main works were dug in two sections into a hill forming the north side of the Jonas Valley, between Crawinkel and Arnstadt. This part of the project was reportedly intended as a last-ditch headquarters facility for Hitler and his staff, should they fall back from Berlin into the interior of Germany (some reports say Hitler actually spent the end of March 1945 in this or another nearby underground Führer Headquarters).
Other theories say this or a nearby site was intended for production of the intercontinental "Amerika" rocket, and even testing and production of a Nazi atomic bomb.
Most of the Jonastal complex never advanced much further than the tunnel digging stage, and the Soviets blasted most of the tunnel entrances after the war. The exact purpose of this facility remains in doubt, as does its code-names ("Siegfried" and "Olga" may actually have been names of other sites).